* poppler/poppler-config.h.in: Add GCC_PRINTF_FORMAT macro to
        annotate printf-like functions (#3638).

        * poppler/Error.h: Add GCC_PRINTF_FORMAT to error().

        * poppler/PSOutputDev.h: Add GCC_PRINTF_FORMAT to
        PSOutputDev::writePSFmt().

        * poppler/PSOutputDev.cc, poppler/GlobalParams.cc: Quiet new
        printf warnings.